what is the dominant gas phase in interstellar space? what is the dominant energy source for such gaseous phase? these are two of the biggest problems that left in interstellar physics. we observed the cygnus x region through [cii] 158 micron line and detected intense diffuse [cii] emission. the [cii] line is the dominant coolant of interstellar gas and thus one of powerful proves to study physical properties of interstellar space. however, wether the dominant emitter of the [cii] line is neutral gas or ionized gas is unclear. thus, interpretation of the observation has large ambiguity. in order to reveal the physical properties of the dominant interstellar gas phase which is traced by the [cii] line, we propose far-infrared spectroscopic observations using the lws full grating scan toward the cyg-ob2 association. multi-line spectroscopy by lws will reveal physical properties of the dominant gas phase with least ambiguity.
Instrument
LWS01
Temporal Coverage
1996-05-20T06:48:24Z/1996-05-20T08:37:04Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the world's first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
European Space Agency, 1999, Spectroscopy Of Interstellar Gas Around The Cygnus Ob2 Association, 1.0, European Space Agency, https://doi.org/10.5270/esa-ohfvykv
